Pyramidalis Nasi.
Levator Labii Superioris Aloeque Nasi.
Levator Proprius Alae Nasi Posterior.
Levator Proprius Alae Nasi Anterior.
Compressor Nasi.
Compressor Narium Minor.
Depressor Alas Nasi.

The Pyramidalis Nasi is a small pyramidal slip of muscular fibre, prolonged downwards from the Occipito-frontalis upon the bridge of the nose, where it becomes tendinous, and blends with the Compressor nasi. As the two muscles descend, they diverge, leaving an angular interval between them, which is filled up by cellular tissue.

Relations. By its upper surface, with the skin. By its under surface, with the frontal and nasal bones. By its outer border, it is connected with the fleshy fibres of the Orbicularis palpebrarum.

The Levator Labii Superioris Aleeque Nasi is a thin triangular muscle, situated along the side of the nose, and extending between the inner margin of the orbit and upper lip. It arises by a pointed extremity from the upper part of the nasal process of the superior maxillary bone, and passing obliquely downwards and outwards, divides into two slips, one of which is inserted into the cartilage of the ala of the nose; the other is prolonged into the upper lip, becoming blended with the Orbicularis and Levator labii proprius.

Relations. In front, with the integument; and with a small part of the Orbicularis palpebrarum above.

Lying upon the superior maxillary bone, beneath this muscle, is a longitudinal muscular fasciculus about an inch in length. It is attached by one end near the origin of the Compressor naris, and by the other to the nasal process about an inch above it; it was described by Albinus as the Musculus 'anomalus,' and by Santorini, as the 'Rhomboideus.'

The Levator Proprius Alae Nasi Posterior (dilator naris posterior) is a small muscle, which is placed partly beneath the proper elevator of the nose and lip. It arises from the margin of the nasal notch of the superior maxilla, and from the sesamoid cartilages, and is inserted into the skin near the margin of the nostril.

The Levator Proprius Alee Nasi Anterior (dilator naris anterior) is a thin, delicate fasciculus, passing from the cartilage of the ala of the nose to the integument near its margin. This muscle is situated in front of the preceding.

The Compressor Nasi is a small, thin, triangular muscle, arising by its apex from the superior maxillary bone, above and a little external to the incisive fossa; its fibres proceed upwards and inwards, expanding into a thin aponeurosis which is attached to the fibro-cartilage of the nose, and is continuous on the bridge of the nose with that of the musclo of the opposite side, and with the aponeurosis of the pyramidalis nasi.

The Compressor Narium Minor is a small muscle, attached by one end to the alar cartilage, and by the other to the integument at the end of the nose.

The Depressor Alee Nasi (myrtiformis) is a short, radiated muscle, arising from the incisive fossa of the superior maxilla; its fibres diverge upwards and outwards, the upper, or ascending set, being inserted into the septum, and back part of the ala of the nose; the lower, or descending, into the back part of the upper segment of the orbicularis.

Nerves. All the muscles of this group are supplied by the facial nerve.

Actions. The Pyramidalis nasi draws down the inner angle of the eyebrow; by some anatomists it is also considered as an elevator of the ala, and, consequently, a dilator of the nose. The Levator labii Superioris alasquc nasi draws upwards the upper lip and ala of the nose; its most important action is upon the nose, which it dilates to a considerable extent. The action of this muscle produces a marked influence over the countenance, and is the principal agent in the expression of contempt. The two Levatores alse nasi are the dilators of the pinna of the nose, and the Compressores nasi appear to act as a dilator of the nose rather than as a constrictor. The Depressor alae nasi is a direct antagonist of the preceding muscles, drawing the upper lip and ala of the nose downwards, and thereby constricting the aperture of the nares.